Belt-saw



UNITED STATES PATENT GEEICE.

DAVID A. CAMERON, 0F BUTLER, PENNSYLVANIA.

BELT-SAW.

Specification of Letters Patent No. 10,678, dated Marchvl, 1854.

To all whom t may concern Be it known that I, DAVID A. CAMERON, of Butler, in the county of Butler and State of Pennsylvania, have invented a new and useful'Improvement in Belt-Sawmills; and I hereby declare the following to be a full and clear description thereof, reference being had to the accompanying drawings herewith presented, which drawings constitut-e a part of said description.

The nature of my invention consists in applying certain devices to obviate the difficulties that have heretofore attended the use of the belt saw. First the expansion and contraction of the saw has rendered it impracticable in the common mode of ,tightenit would cool and contract so as *tol break.` Now to obviate this I have suspended the.

cylinder in a movable frame (W), which slides up and down between the cheeks or guides (Gr, .G,). See t-he drawing.y

Figure 1 is an isometrical view of the millv having a portion of the post removed to show the saw (S) in its place on the drums (D, D,) and it may be observed that this frame (El) is forced upward by the lever (L,) which may be actuated by any ldesired l weight so as to accommodate itself to the length of the saw and give it a constant and uniform tension. The drums are made with flanches (F F,) projecting out around onev end and they are also furnished with mov-` able collars (C, C,) made of metal and vaccurately fitted on the cylinder so as to be adjusted yby the screw pins (P, 1),) these are tapped through the flanches and press with their ends on the collar in order to adjust the saw. E ig. 2 shows a si'de view of the saw (S,) with the drums (1),) their collars (0,) the serewpins (P,) and the frame (W,). There is anotherimpro-vement shown at Fig. 3, the small conical studs or pins (I, I,) are fixed at proper distances in the cylinder which enter into corresponding holes through the saw and insure its motion so there is no danger of its slipping on the drum.

rvThe various other parts of the mill which need not. differ from the common kind are sowell known as to need no minutel description of' their forms or appendages.

j What I claim as my invention', and desire to secure by Letters Patent, is- 1. The lever (L,) with the movable frame 

